Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8a953348cb4722…

MALICIOUS

PDF

92.0 KB Created: 2021-03-18 13:38:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 040974fd66235f37d8d223709e108006 SHA-1: 5aec296c311063bfdc5d2b62af1ebe7afe856111 SHA-256: 1c8a953348cb47224ea6de641f31970bd01b4ead244a4b3f9a638cfcc2c62d96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using many links on low-reputation domains, likely to obscure malicious destinations or for SEO manipulation to appear legitimate. The presence of external URIs suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/wix?keyword=episcopal+church+lectionary+calendar+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382197/normal_5ff03cc45636e.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/gghjgGT/shooters_world_orlando_fl_32811.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/how_much_to_replace_highlander_hybrid_battery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5febedd87a4f3.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/2004_john_deere_gx345_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/LxCCvje/diziginijokexokiziv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_6015033b448e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411919/normal_5fdd7bb02a45d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_602aba9c37ed5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawixojupaxixan.onlinewebshop.net/nbi_registration_form.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/mavusibozam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15b83e5-e972-45f1-96fa-f683cd624a74/91720858317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb56f78c-f58b-49fe-aea5-f24425d922a5/39280855708.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/free_printable_alphabet_chart_black_and_white.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/how_to_put_on_the_full_armor_of_god_daily.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/how_often_should_you_put_ridex_in_your_septic_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6acddd0-d098-4367-b51b-605f03df7795/43300915911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae31527-309a-4db3-9fc7-fe8de7994b03/how_to_add_new_ipad_to_kindle_account.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/xezufurebakuguwajagadapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd484a6-71db-4c61-872d-7fb90a187487/the_innovators_dilemma_by_clayton_christensen.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/doraemon_new_episodes_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/essential_skills_work_visa_employer_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 5492 bytes
SHA-256: fe6ce50831c0a3d2f0db3ec421be6ef8ed6f4a55e2854588c390598d935b60aa
font_01_sfnt_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 10736 bytes
SHA-256: 095722aaa3c5776b4294cfaf447c99862963e18ddf8ab33c64747e22fe6a1149

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